Prepare Royal Icing according to directions included with meringue powder. To decorate jack-o'-lanterns, use icing tinted orange, green and yellow. Spread orange icing on pumpkin-shaped cookie. Spread green on stem. Spread yellow on eyes, noses, and mouths. Let stand at room temperature to set. When set, stack eyes, noses and mouths on pumpkin bases.

To decorate spider webs, use icing tinted green, black, orange, red and white. Spread webs with green icing and spider body with black icing. Let set at room temperature. Meanwhile, pipe on spider legs using black icing in a pastry bag fitted with a #2 tip. Let set at room temperature. Pipe white web using white icing in a pastry bag fitted with a #2 tip. Pipe face and details on spider using red, orange and green icing. Let set at room temperature. When dry, set spiders on top of webs.

To decorate bats and moons, use icing tinted yellow, black, purple, orange, white and red. Spread yellow icing on moon-shaped cookies. Spread black icing on bat body. Outline wings in black. Let stand at room temperature to set. When set, spread purple icing on bat body and wings, pipe face on bat using orange, white, and red icing in pastry bags fitted with #2 tips. Let set at room temperature. When dry, set wings on top of moons and bat bodies on top of wings.